Filter compound material, method for the production thereof and flat filter elements made of the filter compound material

摘要

A filter composite material is provided that includes first and second filtration membranes and a drainage material arranged therebetween. The drainage material and the filtration membranes are laminated using adhesive nets. A flat filter element is made as a blank from the filter composite material and has a geometric shape adapted to the particular end use.

主权项

1. A liquid-filtration composite material comprising five layers, including (i) a drainage fabric having a top and a bottom side and (ii) first and second filtration membranes laminated to the top and bottom sides of the drainage fabric, wherein the lamination between the drainage fabric and the filtration membranes has a dynamic pressure stability above 0.15 bar,
wherein the drainage fabric and the filtration membranes are laminated to each other by two flat adhesive nets disposed on opposing sides of the drainage fabric, said nets extending down the drainage fabric length and across the drainage fabric width within the composite material interior, the adhesive nets have a basis weight in the range from 20 to 80 g·m−2and a mesh density in the range from 100 000 to 400 000 m−2, the filtration membranes are formed from a support nonwoven and a porous membrane layer.